A traditional method of describing behaviour for vehicle exhaust emissions calculations is to use measured driving cycles. There may, for example, be one typical driving cycle fur urban conditions and another for rural conditions as in the US Federal Test Procedure (FTP 75). Traffic simulation models have been widely used for many years in road planning. Such models normally describe driving behaviour in some way. The description may range from a complete driving cycle to approximate data on average speed. One major advantage of simulation models is in the evaluation of future scenarios, in which case changed driving behaviour might also be included. An inventory has shown there exist many models potentially suitable for driving behaviour simulation and for calculations of vehicle exhaust emissions. The next stage of the project should result in recommendations on the choice of models and compilations of parameter values for use in the models. (A)
Abstract